ecshop改造读写分离配置与改造

前两天配置好了mysql主从方式，今天就拿ecshop练习读写分离。以下代码仅供学习参考，不成熟的地方，还需完善。

<?php

$db_name   = "ecshop";

$prefix    = "ecs_";

$timezone    = "Europe/Berlin";

$cookie_path    = "/";

$cookie_domain    = "";

$session = "1440";

$_config = array();

//数据库主服务器设置, 支持多组服务器设置, 当设置多组服务器时, 则会随机使用某个服务器
$_config['master'][1]['dbhost'] = "192.168.2.175:3306";
$_config['master'][1]['dbname'] = "ecshop";
$_config['master'][1]['dbuser'] = "dragon";
$_config['master'][1]['dbpw'] = "loong";

/*
 *$_config['master'][2]['dbhost'] = "";
 *...
 */

//数据库从服务器设置( slave, 只读 ), 支持多组服务器设置, 当设置多组服务器时, 系统每次随机使用
$_config['slave'][1]['dbhost'] = "192.168.2.176:3306";
$_config['slave'][1]['dbname'] = "ecshop";
$_config['slave'][1]['dbuser'] = "ivan";
$_config['slave'][1]['dbpw'] = "loong";

$_config['slave'][2]['dbhost'] = "192.168.2.177:3306";
$_config['slave'][2]['dbname'] = "ecshop";
$_config['slave'][2]['dbuser'] = "ivan";
$_config['slave'][2]['dbpw'] = "loong";

define('EC_CHARSET','utf-8');

define('ADMIN_PATH','admin');

define('AUTH_KEY', 'this is a key');

define('OLD_AUTH_KEY', '');

define('API_TIME', '');

?>

初始化数据连接类

    /* 初始化数据库类   
     * 如果配置了从服务器，则初始化从库类  
    */    
    if(count($_config['slave'])) {    
        require(ROOT_PATH . 'includes/cls_mysql_slave.php');    
        $db = new cls_mysql_slave($_config);    
    }else{    
        require(ROOT_PATH . 'includes/cls_mysql.php');    
        $db = new cls_mysql($_config);    
    }    

增加cls_mysql_slave.php从库类

    <?php  
      
    require(ROOT_PATH . 'includes/cls_mysql.php');  
    class cls_mysql_slave extends cls_mysql  
    {  
        var $slaveid = null;  
      
        function set_config($config){  
            if(!empty($this->config['slave'])) {  
                $this->slaveid = array_rand($this->config['slave']);  
            }  
            parent::set_config($config);  
        }  
      
        /* 随机分配从库连接 */  
        function set_slave_config() {           
            $this->settings = $this->config['slave'][$this->slaveid];  
            $this->settings['charset'] = $this->config['charset'];  
            $this->settings['pconnect'] = $this->config['pconnect'];  
        }  
      
        function slave_connect() {  
            $this->set_slave_config();  
            $dbhost = $this->settings['dbhost'];  
            $dbuser = $this->settings['dbuser'];  
            $dbpw = $this->settings['dbpw'];  
            $dbname = $this->settings['dbname'];  
            $this->connect($dbhost, $dbuser, $dbpw, $dbname);  
              
        }  
      
      
        function query($sql, $type = '') {  
            // 如果执行查询操作，则执行从库连接  
            if($this->slaveid && strtoupper(substr($sql, 0 , 6)) == 'SELECT') {  
                $this->slave_connect();  
            }else{  
                parent::set_config($this->config);  
                $dbhost = $this->settings['dbhost'];  
                $dbuser = $this->settings['dbuser'];  
                $dbpw = $this->settings['dbpw'];  
                $dbname = $this->settings['dbname'];  
                $this->connect($dbhost, $dbuser, $dbpw, $dbname);  
            }  
            return parent::query($sql, $type);  
        }  
      
        /* 删除失败连接*/  
        function del_error_link(){  
            unset($this->config['slave'][$this->slaveid]);  
            $this->set_config($this->config);  
            $this->set_slave_config();  
            $dbhost = $this->settings['dbhost'];  
            $dbuser = $this->settings['dbuser'];  
            $dbpw = $this->settings['dbpw'];  
            $dbname = $this->settings['dbname'];  
            $this->connect($dbhost, $dbuser, $dbpw, $dbname);  
        }  
               
    }  

cls_mysql.php文件类修改

    <?php  
      
    if (!defined('IN_ECS'))  
    {  
        die('Hacking attempt');  
    }  
      
    class cls_mysql  
    {  
        var $link_id    = NULL;  
      
        var $settings   = array();  
      
        var $queryCount = 0;  
        var $linkCount = 0;  
        var $queryTime  = '';  
        var $queryLog   = array();  
      
        var $max_cache_time = 300; // 最大的缓存时间，以秒为单位  
      
        var $cache_data_dir = 'temp/query_caches/';  
        var $root_path      = '';  
      
        var $error_message  = array();  
        var $platform       = '';  
        var $version        = '';  
        var $dbhash         = '';  
        var $starttime      = 0;  
        var $timeline       = 0;  
        var $timezone       = 0;  
      
        var $mysql_config_cache_file_time = 0;  
      
        var $mysql_disable_cache_tables = array(); // 不允许被缓存的表，遇到将不会进行缓存  
        var $config = array();  
      
        function __construct($config, $charset = 'utf8', $pconnect = 0, $quiet = 0)  
        {  
            $this->cls_mysql($config, $charset, $pconnect, $quiet);  
        }  
      
        function cls_mysql($config, $charset = 'utf8', $pconnect = 0, $quiet = 0)  
        {  
            if(!empty($config)) {  
                $config['charset'] = $charset;  
                $config['pconnect'] = $pconnect;  
                $this->config = $config;  
            }  
              
            if (defined('EC_CHARSET'))  
            {  
                $charset = strtolower(str_replace('-', '', EC_CHARSET));  
            }  
      
            if (defined('ROOT_PATH') && !$this->root_path)  
            {  
                $this->root_path = ROOT_PATH;  
            }  
      
            $this->set_config($this->config);  
      
            if ($quiet)  
            {  
                $dbhost = $this->settings['dbhost'];  
                $dbuser = $this->settings['dbuser'];  
                $dbpw = $this->settings['dbpw'];  
                $dbname = $this->settings['dbname'];  
                $this->connect($dbhost, $dbuser, $dbpw, $dbname, $charset, $pconnect, $quiet);  
            }  
        }  
      
        //随机分配数据库连接  
        function set_config($config) {  
            $sid = array_rand($config['master']);  
            $settings = $config['master'][$sid];  
            $settings['sid'] = $sid;  
            $settings['charset'] = $this->config['charset'];  
            $settings['pconnect'] = $this->config['pconnect'];  
            $this->settings = $settings;  
        }  
      
        function connect($dbhost, $dbuser, $dbpw, $dbname = '', $charset = 'utf8', $pconnect = 0, $quiet = 0)  
        {  
            if ($pconnect)  
            {  
                if (!($this->link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw)))  
                {  
                    if (!$quiet)  
                    {  
                        $this->ErrorMsg("Can't pConnect MySQL Server!");  
                    }  
      
                    return false;  
                }  
            }  
            else  
            {  
                if (PHP_VERSION >= '4.2')  
                {  
                    $this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw, true);  
                }  
                else  
                {  
                    $this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw);  
      
                    mt_srand((double)microtime() * 1000000); // 对 PHP 4.2 以下的版本进行随机数函数的初始化工作  
                }  
                if (!$this->link_id)  
                {  
                    if (!$quiet)  
                    {                    
                        //连接超过10次，中断连接，抛出错误    
                        if($this->linkCount>9){  
                            $this->ErrorMsg("Can't Connect MySQL Server!");  
                        }   
                        $this->linkCount++;  
                        $this->del_error_link();  
                    }  
      
                    return false;  
                }  
            }  
      
            $this->dbhash  = md5($this->root_path . $dbhost . $dbuser . $dbpw . $dbname);  
            $this->version = mysql_get_server_info($this->link_id);  
      
            /* 如果mysql 版本是 4.1+ 以上，需要对字符集进行初始化 */  
            if ($this->version > '4.1')  
            {  
                if ($charset != 'latin1')  
                {  
                    mysql_query("SET character_set_connection=$charset, character_set_results=$charset, character_set_client=binary", $this->link_id);  
                }  
                if ($this->version > '5.0.1')  
                {  
                    mysql_query("SET sql_mode=''", $this->link_id);  
                }  
            }  
      
            $sqlcache_config_file = $this->root_path . $this->cache_data_dir . 'sqlcache_config_file_' . $this->dbhash . '.php';  
      
            @include($sqlcache_config_file);  
      
            $this->starttime = time();  
      
            if ($this->max_cache_time && $this->starttime > $this->mysql_config_cache_file_time + $this->max_cache_time)  
            {  
                if ($dbhost != '.')  
                {  
                    $result = mysql_query("SHOW VARIABLES LIKE 'basedir'", $this->link_id);  
                    $row    = mysql_fetch_assoc($result);  
                    if (!empty($row['Value']{1}) && $row['Value']{1} == ':' && !empty($row['Value']{2}) && $row['Value']{2} == "\")  
                    {  
                        $this->platform = 'WINDOWS';  
                    }  
                    else  
                    {  
                        $this->platform = 'OTHER';  
                    }  
                }  
                else  
                {  
                    $this->platform = 'WINDOWS';  
                }  
      
                if ($this->platform == 'OTHER' &&  
                    ($dbhost != '.' && strtolower($dbhost) != 'localhost:3306' && $dbhost != '127.0.0.1:3306') ||  
                    (PHP_VERSION >= '5.1' && date_default_timezone_get() == 'UTC'))  
                {  
                    $result = mysql_query("SELECT UNIX_TIMESTAMP() AS timeline, UNIX_TIMESTAMP('" . date('Y-m-d H:i:s', $this->starttime) . "') AS timezone", $this->link_id);  
                    $row    = mysql_fetch_assoc($result);  
      
                    if ($dbhost != '.' && strtolower($dbhost) != 'localhost:3306' && $dbhost != '127.0.0.1:3306')  
                    {  
                        $this->timeline = $this->starttime - $row['timeline'];  
                    }  
      
                    if (PHP_VERSION >= '5.1' && date_default_timezone_get() == 'UTC')  
                    {  
                        $this->timezone = $this->starttime - $row['timezone'];  
                    }  
                }  
      
                $content = '<' . "?php
" .  
                           '$this->mysql_config_cache_file_time = ' . $this->starttime . ";
" .  
                           '$this->timeline = ' . $this->timeline . ";
" .  
                           '$this->timezone = ' . $this->timezone . ";
" .  
                           '$this->platform = ' . "'" . $this->platform . "';
?" . '>';  
      
                @file_put_contents($sqlcache_config_file, $content);  
            }  
      
            /* 选择数据库 */  
            if ($dbname)  
            {  
                if (mysql_select_db($dbname, $this->link_id) === false )  
                {  
                    if (!$quiet)  
                    {  
                        $this->ErrorMsg("Can't select MySQL database!");  
                    }  
      
                    return false;  
                }  
                else  
                {  
                    return true;  
                }  
            }  
            else  
            {  
                return true;  
            }  
        }  
      
        ......  
      
        /* 删除失败连接*/  
        function del_error_link(){  
            unset($this->config['master'][$this->settings['sid']]);  
            $this->set_config($this->config);  
            $dbhost = $this->settings['dbhost'];  
            $dbuser = $this->settings['dbuser'];  
            $dbpw = $this->settings['dbpw'];  
            $dbname = $this->settings['dbname'];  
            $this->connect($dbhost, $dbuser, $dbpw, $dbname);  
        }  
    }  

转载：http://blog.csdn.net/very_loong/article/details/7999895